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(0/3)*x-15 = 0.2*x-5 // - 0.2*x-5
(0/3)*x-(0.2*x)-15+5 = 0
5-0.2*x-15 = 0
-0.2*x-10 = 0 // + 10
-0.2*x = 10 // : -0.2
x = 10/(-0.2)
x = -50
x = -50
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